Don, I feel your pain!
The M22 bullets seem to be slightly longer than most.
Greg58
They are certainly wider. There is a known issue amongst Ruger revolver owners with M22s often not chambering in Bearcats and Single Sixes. M22s will go into my Bearcat's chambers about 1/4" then can go no further. CCIs, Federals and Remingtons fit just right and drop in and out properly, and shoot accurately. This isn't true of all M22s but I'd say 75% out of any box will not chamber in my 'cat.
Other types of Winchester like the 333 bulk packs also stick, but only about a third of them. I'm pretty much through buying Winchester rimfire ammo for that reason. I'll shoot up what I have but I don't like having stuff that only chambers in some of my guns.
M22 was also the stuff they recalled a couple years ago due to double charges.